Child Growth Percentile Calculator
Find where your child falls on the WHO growth charts. Enter their date of birth, measurement date, and current height and weight to see their percentiles for height-for-age, weight-for-age, and BMI-for-age. This calculator uses the official WHO Child Growth Standards (0–5 years) and WHO Growth Reference (5–19 years) with the LMS method for accurate percentile calculations.
↳Newborn
How We Calculate This
Percentiles are calculated using the WHO LMS method. Each age/sex combination has three parameters: L (Box-Cox power for skewness), M (median), and S (coefficient of variation). The Z-score is computed as Z = ((X/M)^L - 1) / (L × S), then converted to a percentile using the standard normal distribution. Data sources: WHO Child Growth Standards (0–5 years) for length/height-for-age, weight-for-age, and BMI-for-age; WHO Growth Reference 2007 (5–19 years) for height-for-age, weight-for-age (to age 10), and BMI-for-age.
Frequently Asked Questions
What growth charts does this calculator use?
This calculator uses official WHO (World Health Organization) growth data: the WHO Child Growth Standards for ages 0–5 years, and the WHO Growth Reference 2007 for ages 5–19 years. These are the international gold standard used by pediatricians worldwide.
What does my child's percentile mean?
A percentile shows how your child compares to other children of the same age and sex. For example, the 75th percentile means your child is taller or heavier than 75% of children their age. The 50th percentile is the median — perfectly average.
Should I worry if my child is below the 50th percentile?
No. A wide range of percentiles is normal. What matters more is consistent growth along a percentile curve over time. A child at the 20th percentile who stays there is growing normally. Sudden jumps or drops across percentile lines are more concerning than the actual number.
Why is weight percentile only available up to age 10?
The WHO only provides weight-for-age reference data up to age 10. After that, BMI-for-age is a more meaningful measure because weight alone doesn't account for the wide variation in height during puberty. The BMI percentile is available for ages 2–19.
Why are there separate charts for boys and girls?
Boys and girls have different growth patterns, especially during puberty. Boys tend to be slightly longer at birth and grow taller on average. Growth spurts happen at different ages. Using sex-specific charts ensures accurate percentile comparisons.
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You might also find these calculators helpful: BMI Calculator, and Calorie Calculator.
This calculator provides estimates for educational purposes only. Results vary based on individual factors. Consult a healthcare professional for personalized advice.